What must be added to 5x-2x + 6x +7 to make the sumx+3x-x + 1?
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now , first of all simply the question
5x -2x +6x +7 = 9 x + 7
3x -x + 1 = 2x +1
let a must be added to 9x +7 to make sum 2 x + 1
9x + 7 + a= 2x +1
a= -7x - 6
so, - 7x -6 must be added
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